Power supply



FIG. 1 is a top and front perspective view of a power supply showing my new design;

FIG. 2 is a bottom and left side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof, the right side elevation view being a mirror image;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view thereof, shown in environmental use.

The broken line portions of the power supply in all views represent unclaimed portions of the claimed design and form no part thereof. 

The ornamental design for a power supply, as shown and described. 